position from acca

[Will Singleton]

[d]8/4r3/8/kp2P3/p2KR3/5Rb1/8/8 b - -

From the game Petir-Amateur. Black can draw with BxP, but some progs don't see it quickly. Seems simple enough, but I suppose the sac limits the resulting search too much.

[Albert Silver]

[d]8/4r3/8/kp2P3/p2KR3/5Rb1/8/8 b - -

From the game Petir-Amateur. Black can draw with BxP, but some progs don't see it quickly. Seems simple enough, but I suppose the sac limits the resulting search too much.

I presume only programs without tablebase support.

Albert

[Will Singleton]

I presume only programs without tablebase support.

Albert

Manys progs see it quickly without tb, many don't. Fruit 2.2.1 takes a long time to see it, while Ruffian sees it immediately. I don't use tbs myself.

[bob]

[d]8/4r3/8/kp2P3/p2KR3/5Rb1/8/8 b - -

From the game Petir-Amateur. Black can draw with BxP, but some progs don't see it quickly. Seems simple enough, but I suppose the sac limits the resulting search too much.

I presume only programs without tablebase support.

Albert

You don't need tables here:

1 0.02 1.62 1. ... Rd7+ 2. Kc5nps)
1 0.02 1.61 1. ... Bxe5+ 2. Rxe5 Rxe5 3. Kxe5
1-> 0.02 1.61 1. ... Bxe5+ 2. Rxe5 Rxe5 3. Kxe5
2 0.02 -1 1. ... Bxe5+!! (7Knps)
2 0.02 -3 1. ... Bxe5+!! (7Knps)
2 0.02 -0.01 1. ... Bxe5+ 2. Rxe5 Rxe5 3. Kxe5 Kb4
4. Kd5 a3 5. Kc6 Ka4 6. Rf2 b4 7. Kc5
Ka5 <HT>
2-> 0.02 -0.01 1. ... Bxe5+ 2. Rxe5 Rxe5 3. Kxe5 Kb4
4. Kd5 a3 5. Kc6 Ka4 6. Rf2 b4 7. Kc5
Ka5 <HT>
3 0.02 -0.01 1. ... Bxe5+ 2. Rxe5 Rxe5 3. Kxe5 Kb4
4. Kd5 a3 5. Kc6 Ka4 6. Rf2 b4 7. Kc5
Ka5 <HT>
3-> 0.02 -0.01 1. ... Bxe5+ 2. Rxe5 Rxe5 3. Kxe5 Kb4
4. Kd5 a3 5. Kc6 Ka4 6. Rf2 b4 7. Kc5
Ka5 <HT>